Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of rat kidney tubules infected with uropathogenic E. coli to study early local bacterial inflammation

ABSTRACT: The transcriptome of early local kidney inflammation was profiled. Rat kidney tubules were injected with uropathogenic E. coli or PBS control. After incubation time, kidney samples were processed and transcription was assayed. Three rats were used per condition.

ORGANISM(S): Rattus norvegicus

SUBMITTER: Jorrit Boekel

PROVIDER: E-MEXP-2136 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

ACCESS DATA

Publications

Comparative tissue transcriptomics reveal prompt inter-organ communication in response to local bacterial kidney infection.

Boekel Jorrit J Källskog Orjan O Rydén-Aulin Monica M Rhen Mikael M Richter-Dahlfors Agneta A

BMC genomics 20110221

<h4>Background</h4>Mucosal infections elicit inflammatory responses via regulated signaling pathways. Infection outcome depends strongly on early events occurring immediately when bacteria start interacting with cells in the mucosal membrane. Hitherto reported transcription profiles on host-pathogen interactions are strongly biased towards in vitro studies. To detail the local in vivo genetic response to infection, we here profiled host gene expression in a recent experimental model that assures ...[more]

PMID: 21338499

Similar Datasets

Project description:Background: It is recognized that atherosclerosis can regresses at least in animal models. However, little is known about the mechanisms. We induced regression of advanced atherosclerosis in apolipoprotein E deficient (APOE/) mice and studied underlying mechanisms. Unexpectedly, our study led to the role of interleukin-7 (IL-7) in atherogenesis. Methods and Results: We treated APOE/ mice fed a high cholesterol diet for 30 weeks to induce advanced lesions with a helper-dependent adenoviral vector expressing human apoE3 (HDAd-gE3), and analyzed the regression of atherosclerosis after 41 weeks. Using microarray analysis, we identified IL-7 as one of most significantly affected genes by lowering cholesterol. To answer why IL-7 is downregulated by reduced cholesterol, we studied effects of IL-7 on endothelial cells (ECs). Our major findings were (1) long-term lowering cholesterol induced regression of advanced atherosclerosis. (2) Microarray analysis identified multiple signaling pathways affected by lowering cholesterol. (3) Correction for multiple testing revealed that IL-7 expression was downregulated, whereas gamma-sarcoglycan and Î±-actin were upregulated. (4) Oxidized LDL upregulated IL-7 expression in macrophages but not in aorta ECs or smooth muscle cells. (5) IL-7 increased the expression of cell adhesion molecules and chemokine in ECs and promoted monocyte adhesion to ECs. (6) Systemic elevation of IL-7 induced inflammatory response and recruited monocyte/macrophage to the lesions without increasing plasma cholesterol. Conclusion: Our finding suggest that IL-7 inflames endothelium and triggers the adhesion/recruitment of monocyte/macrophages to the atherosclerotic lesions and thus plays a direct role in development of atherosclerosis. Key Words: arteriosclerosis, gene therapy, hypercholesterolemia, interleukins, cell adhesion molecules Female APOE-/- mice (8 weeks of age) on a C57BL/6 background were purchased from Jackson Laboratory and were fed a diet containing 0.2% (w/w) cholesterol and 10% (v/w) coconut oil to induce atherosclerosis for 30 weeks. Mice were then divided into 3 groups, (n=15/group), treated with a tail vein injection of helper-dependent adenovirus expressing human apolipoprotein E3 (HDAd-gE3, 5 x 1012 viral particles/kg, n=11, vector), empty vector (HDAd-0, 5 x 1012 VP/kg, n=11, vector control) or phosphate buffered saline (PBS, vehicle) and sacrificed 10 days after. Three aortas extending sinus to arch were pooled for RNA extraction with an RNeasy kit (Qiagen). Sample ID 12031: E4: vector control (HDAd-0) 12043: E5: vector control 12046: V2: vector 12047: V3: vector 12048: V4: vector 12051: B1: vehicle (PBS) 12053: B3: vehicle 12054: B4: vehicle 12039: E3: vector control

Project description:The use of calcineurin inhibitor (CI) immunosuppressants has significantly improved the early allograft survival rate in organ transplantation. However, CI therapy has been associated with chronic nephrotoxicity, which limits their long-term utility. In order to understand the mechanisms of the toxicity, we analyzed the gene expression changes that underlie the development of CI immunosuppressant-mediated nephrotoxicity, in male Sprague-Dawley (SD) rats dosed daily with cyclosporine (CsA), FK506 or rapamycin (Rapa) for 1 to 28 days. We identified a group of genes, whose expression in rat kidney is quantitatively correlated with CI-induced kidney injury as observed in changes in blood urea nitrogen (BUN) levels and kidney histopathology. These genes include both up-regulated genes, such as Ren1 and Klks3, and down-regulated genes, such as Calb1, Egf, NCC, and kidney specific Wnk1 (KS-Wnk1). Using the down-regulated genes alone we successfully predicted CI immunosuppressant-mediated kidney injury in rats following 7 days of treatment. Among these genes are two mechanism-related genes, NCC and KS-Wnk1, both of which are involved in the sodium transport in the distal nephrons. The down-regulation of both genes at the mRNA and protein level in rat kidney following CI treatment was confirmed by quantitative RT-PCR and immunohistochemical staining, respectively. We hypothesize that decreased expression of NCC may cause reduced sodium chloride reabsorption in the distal tubules, and contribute to the prolonged activation of the Renin-Angiotensin-System (RAS), a demonstrated contributor to the development of CI-induced nephrotoxicity in both animal models and clinical settings. Therefore, NCC and KS-Wnk1 could potentially be used as biomarkers for early detection and prevention of CI-related nephrotoxicity in clinical practice. Male SD rats approximately 5-7 weeks old were maintained on certified rodent chow and dosed i.p. with olive oil, CsA (CAS # 59865-13-3, 2.5 or 25 mg/kg/day), FK506 (CAS # 104987-11-3, 0.6 or 6 mg/kg/day), or Rapa (CAS # 53123-88-9, 1 or 10 mg/kg/day) (LC Laboratories, Woburn, MA) for 1, 7, 14 or 28 consecutive days. Blood was collected at the terminal necropsy (24 hours after 1, 7, 14 or 28 days of treatment) for clinical chemistry analysis. Each kidney was cut in half (one cross section and the other longitudinal). One half of the left kidney and one half of the right kidney were used for histopathological evaluation and the remaining portions of the kidney were processed for gene expression analysis. Total RNA was isolated from rat kidney using QIAGEN RNeasy kits (QIAGEN Inc., Valencia, CA) following manufacture’s instruction. The rat genome array (RAT 230 2.0) GeneChip (Affymetrix, Santa Clara, CA) was used for gene expression profiling.

Dataset Information

Transcription profiling of rat kidney tubules infected with uropathogenic E. coli to study early local bacterial inflammation

Publications

Comparative tissue transcriptomics reveal prompt inter-organ communication in response to local bacterial kidney infection.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure